I'd also like to use BackBlaze as my cloud destination. It has one of the best (if not the best) prices for data backups of 500gb+.

How high on the wishlist is this feature? My mother needs a good backup solution for her terabytes of photo storage, and despite my preferring the Backup4All software, being unable to use Backblaze as the destination means the storage costs would be a lot higher, making it hard to recommend over free solutions such as the standard BackBlaze software.